薄壁铜管游动芯头低频振动拉拔力影响规律

为准确描述薄壁铜管游动芯头低频振动过程中拉拔力影响因素的变化,借助有限元分析软件MSC.Marc,建立铜管低频振动拉拔模型,分析拉拔速度、激振振幅、激振频率、模具锥角(外模半锥角、芯头半锥角)对拉拔力的影响。结果表明,拉拔速度的增加将引起拉拔力的小幅度增加,在激振频率为80～170Hz范围内拉拔力先减小后增大,激振振幅的增加将引起拉拔力的显著降低,外模半锥角与芯头半锥角存在最佳的模具锥角组合。

Law of Affecting Low-frequency Vibration Pulling Force of Thin-walled Copper Tube Swimming Core

In order to accurately describe the variation law of the influencing factors of pulling force during the low-frequency vibration of the thin-walled copper tube,the MSC.Marc was used to establish the low-frequency vibration drawing model of the copper tube,and the influence of drawing speed,excitation amplitude,excitation frequency and mold cone angle(the outer mold half cone angle,the core half cone angle)on the drawing force was analyzed.The results show that with the increase of drawing speed,drawing force is increased slightly.In the range of excitation frequency of 80-150 Hz,the pulling force is decreased firstly and then increased.With increasing in excitation amplitude,pulling force is decreased greatly.And outer mold half cone angle and core half cone angle have a best mold cone angle combination.